本文整理汇总了VB.NET中System.Data.IDataReader.NextResult方法的典型用法代码示例。如果您正苦于以下问题：VB.NET IDataReader.NextResult方法的具体用法？VB.NET IDataReader.NextResult怎么用？VB.NET IDataReader.NextResult使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Data.IDataReader的用法示例。
在下文中一共展示了IDataReader.NextResult方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: Module1
' 导入命名空间
Imports System.Data
Imports System.Data.SqlClient
Imports System.Data.OleDb
Imports System.Data.Odbc
Module Module1
Dim connectionTypeName As String = "SqlClient"
Dim connectionString As String = "Data Source=(local);Initial Catalog=AdventureWorks2012;Integrated Security=SSPI"
' Dim connectionTypeName As String = "Odbc"
' Dim connectionString As String = "Driver={SQL Server Native Client 11.0};Server=(local);Database=AdventureWorks2012;Trusted_Connection=Yes"
' Dim connectionTypeName As String = "OleDb"
' Dim connectionString As String = "Provider=SQLNCLI11;Data Source=(local);Initial Catalog=AdventureWorks2012;Integrated Security=SSPI"
Sub Main()
Using connection As IDbConnection = DatabaseConnectionFactory.GetConnection(connectionTypeName, connectionString)
Dim command As IDbCommand = connection.CreateCommand()
command.Connection = connection
'these 2 queries are executed as a single batch and return 2 separate results
command.CommandText =
"SELECT CountryRegionCode, Name FROM Person.CountryRegion;" +
"SELECT CountryRegionCode, StateProvinceCode, Name, StateProvinceID FROM Person.StateProvince;"
connection.Open()
Using reader As IDataReader = command.ExecuteReader()
'process the first result
displayCountryRegions(reader)
'use NextResult to move to the second result and verify it is returned
If Not reader.NextResult() Then
Throw New InvalidOperationException("Expected second result (StateProvinces) but only one was returned")
End If
'process the second result
displayStateProvinces(reader)
reader.Close()
End Using
connection.Close()
End Using
End Sub
Sub displayCountryRegions(reader As IDataReader)
If Not reader.FieldCount = 2 Then
Throw New InvalidOperationException("First resultset (CountryRegions) must contain exactly 2 columns")
End If
While reader.Read()
Console.WriteLine("CountryRegionCode={0}, Name={1}" _
, reader.GetString(reader.GetOrdinal("CountryRegionCode")) _
, reader.GetString(reader.GetOrdinal("Name")))
End While
End Sub
Sub displayStateProvinces(reader As IDataReader)
If Not reader.FieldCount = 4 Then
Throw New InvalidOperationException("Second resultset (StateProvinces) must contain exactly 4 columns")
End If
While reader.Read()
Console.WriteLine("CountryRegionCode={0}, StateProvinceCode={1}, Name={2}, StateProvinceID={3}" _
, reader.GetString(reader.GetOrdinal("CountryRegionCode")) _
, reader.GetString(reader.GetOrdinal("StateProvinceCode")) _
, reader.GetString(reader.GetOrdinal("Name")) _
, reader.GetInt32(reader.GetOrdinal("StateProvinceID")))
End While
End Sub
Class DatabaseConnectionFactory
Shared Function GetSqlConnection(connectionString As String) As SqlConnection
Return New SqlConnection(connectionString)
End Function
Shared Function GetOdbcConnection(connectionString As String) As OdbcConnection
Return New OdbcConnection(connectionString)
End Function
Shared Function GetOleDbConnection(connectionString As String) As OleDbConnection
Return New OleDbConnection(connectionString)
End Function
Public Shared Function GetConnection(connectionTypeName As String, connectionString As String) As IDbConnection
Select Case connectionTypeName
Case "SqlClient"
Return GetSqlConnection(connectionString)
Case "Odbc"
Return GetOdbcConnection(connectionString)
Case "OleDb"
Return GetOleDbConnection(connectionString)
Case Else
Throw New ArgumentException("Value must be SqlClient, Odbc or OleDb", "connectionTypeName")
End Select
End Function
End Class
End Module